[R-390] CU168 Multicoupler Question

[David Ross]

   I had a couple of CU-168s, tried 'em both on the AM broadcast band. 
Compared to their output at 10 MCs, response on both units was real 
close to 3db down at 2 MCs.

   I fussed with them a little and could not come up with a good way to 
lower that bottom 3db point.  Whatever high-pass filter there is in the 
CU-168 seems to be built in the balanced line signal distribution scheme 
in the unit -  it is certainly not as simple as bypassing a single 
filter module.

   The CU-168 high-pass filter is not a brickwall filter -  if I 
remember, response at 500 KCs was only like 20db down from that at 10 MCs.

   Good luck with it, please post details of any success you have 
getting the CU-168 to work well down to 500 KCs.

73
Dave Ross    N7EPI



John KA1XC wrote:

> Chuck,
> I believe you're thinking about the CU-872 multicoupler, it has a high-pass
> filter module fitted with BNC connectors under the chassis which is very
> easy to bypass. The CU-168 does not have this, it's simply transformer and
> choke coupled all the way through. It is flat down to 2 MC, so it'll
> probably work on the top end of the broadcast band.
> 73,
> John
> 
> 
> 
>>Somewhere, I remember reading that it is possible to bypass the high
>>pass filter in this unit so it covers the AMBC band.. Can any one help
>>me with the details?
>>TIA,
>>Chuck
>